<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <script>
    // console.log("10"+2);
    //
    // console.log("2"*"3");
    // console.log("四"*"五")

    var x="23"
    console.log(parseInt(x)+3);
    console.log(parseFloat("3.4"))
    console.log(null==undefined)
       console.log(parseInt("12px"))
    console.log(parseFloat("asp"))
    console.log(1+2+"3"+4+5)
  </script>
</head>
<body>
    <input type="button" value="跳转" onclick="location.href='test.html'">
</body>
</html>